    // 工具：同步Post表单请求
    private Response postForm(String url, Map<String, String> formParams) throws IOException {
        RequestBody body = RequestBody.create(FORM, mapToFormData(formParams)); // 修正了参数顺序
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
        return client.newCall(request).execute();
    }